Moredhel84 said:
^^ Wouldn't more torque actually be an advantage over the power? Torque being the pulling/spinning power behind it all, wouldn't this be a positive gain?
Not being a mechanic and all, I heard a while back that power is derived from torque over certain RPM ranges etc, so wouldn't increasing your torque also add gains to your overall KW as well? (Pure speculation on my behalf here)
Oh and one more thing, usually when changing gear ratios a lot of us would be thinking along the lines of getting a LSD/spool installed (if not already) at the same time, saving money. Wouldn't the added benefit of having more traction on the dyno (due to no more single spinner) also add marginally to your overall KW?
Torque is twisting force, torque is actually what gets a vehicle of the line, so in drag racing, you take of from the line your using torque, then power takes over after torque fases out, change gears and it all happens again, every gear change. So if you can remeber it as torque gets u moving, power keeps you going.
A chassis dyno calculates on load vs speed, a car will make different power in different gears, due to driveline loss, nothing to do with changing ratios.
When diff ratios are changed torque is increased, so for eg. from 3.07 ratio to 3.9 ration there is a very large torque increase on the dyno. the engine wont produce any more torque, a dyno is caculating torque from load vs speed.
LSD's or spools are really a must when building a diff as the extra cost pays itself of very quickly, very very rarely a worn lsd will upset power figures on a dyno, as in straight driving the lsd isnt even working.